The upper values of plasma creatine kinase of professional soccer players during the Brazilian National Championship - Lazarim, F. L.; Antunes-Neto, J. M. F.; da Silva, F. O. C.; Nunes, L. A. S.; Bassini-Cameron, A.; Cameron, L. C.; Alves, A. A.; Brenzikofer, R.; Vaz de Macedo, D. (Journal of Science and Medicine in Sport, 2009)